Work And Power

Question 1

Whats the equation for kinetic energy ?

Answer 1

1/2 ✖️ mass ✖️ speed (squared)

Question 2

Whats the relationship between power , work done and time taken

Answer 2

Power = work done ➗ time taken

Question 3

Describe wind power , pros and cons

Answer 3

Wind power works as the wind turns blades which turn a generator
Pros - renewable
Cons-large , loud and in the way

Question 4

describe the hydroelectric power stations and pros and cons

Answer 4

Water stored behind a dam flows through , turns a turbine and drives the generators

Question 5

Describe wave power , pros and cons

Answer 5

Wave power is when waves drive generators by bobbing motion
Pros- renewable
Cons -large area needed , sea is corrosive

Question 6

Tidal power , pros and cons

Answer 6

tidal energy - turn turbines and then generators
Pros -renewable
Cons - only works when tides are strong, disturbs ecology

Question 7

Geothermal energy , pros and cons

Answer 7

Geothermal- heat from the rocks under ground , heat water , steam turns turbines
Pros -renewable
Cons -only works in appropriate places and os expensive

Question 8

Describe solar panels and their pros and cons

Answer 8

Sunlight turned into energy via solar panels
Pros - renewable
Cons - expensive and only in sunny areas

Question 9

Fossil fuel power stations , pros and cons

Answer 9

Coal or oil burnt to boil water , water turns generators
Pros - easy to access fuel and makes lots of energy
Cons - greenhouse gasses and finite fuel supplies

Question 10

Nuclear power stations pros and cons

Answer 10

Nuclear fission produces heat which boils water , the steam turns turbines which drives the generators
Pros -compact fuel source and very powerful
Cons -if gone wrong massive consequences and quite expensive

Question 11

What is the relationship between force , distance moved and work done

Answer 11

Work done
—————————-
Force ✖️ distance moved